diff --git a/src/core/CCMap.mli b/src/core/CCMap.mli
index bd08171e..6c7205f5 100644
--- a/src/core/CCMap.mli
+++ b/src/core/CCMap.mli
@@ -16,6 +16,7 @@ module type OrderedType = Map.OrderedType
 
 module type S = sig
   include Map.S
+  (** @inline *)
 
   val get : key -> 'a t -> 'a option
   (** [get k m] returns [Some v] if the current binding of [k] in [m] is [v],
diff --git a/src/core/CCNativeint.mli b/src/core/CCNativeint.mli
index 16f3a74b..02352e08 100644
--- a/src/core/CCNativeint.mli
+++ b/src/core/CCNativeint.mli
@@ -18,6 +18,7 @@
 include module type of struct
   include Nativeint
 end
+(** @inline *)
 
 val min : t -> t -> t
 (** [min x y] returns the minimum of the two integers [x] and [y].
diff --git a/src/core/CCOption.mli b/src/core/CCOption.mli
index a50d6ad6..42476859 100644
--- a/src/core/CCOption.mli
+++ b/src/core/CCOption.mli
@@ -6,6 +6,7 @@
    @since 3.6 *)
 
 include module type of Option
+(** @inline *)
 
 val map_or : default:'b -> ('a -> 'b) -> 'a t -> 'b
 (** [map_or ~default f o] is [f x] if [o = Some x], [default] otherwise.
diff --git a/src/core/CCPair.mli b/src/core/CCPair.mli
index 76cd1af0..55f4f306 100644
--- a/src/core/CCPair.mli
+++ b/src/core/CCPair.mli
@@ -5,6 +5,7 @@
 [@@@ifge 5.4]
 
 include module type of Pair
+(** @inline *)
 
 [@@@else_]
 
diff --git a/src/core/CCResult.mli b/src/core/CCResult.mli
index 71304c5c..b4820fdf 100644
--- a/src/core/CCResult.mli
+++ b/src/core/CCResult.mli
@@ -17,6 +17,7 @@ type 'a printer = Format.formatter -> 'a -> unit
 (** {2 Basics} *)
 
 include module type of Result
+(** @inline *)
 
 val return : 'a -> ('a, 'err) t
 (** Successfully return a value. *)